[erlang-questions] performance vs msg queue length

Per Melin <>
Tue Apr 20 21:15:12 CEST 2010


On Tue, Apr 20, 2010 at 8:41 PM, John Erickson <> wrote:
> [begin [ self() ! a || _ <- lists:seq(1,N) ],
>>        S = now(),
>>        [ receive _ -> ok end || _ <- lists:seq(1,N) ],
>>        io:format("~w~n", [timer:now_diff(now(), S) / N])
>>  end || N <- [1,10,100,1000,10000]].
>>
>> ...
>>
>> If I put it into a module, add 1e5 and 1e6 then I get:
>>
>> 1> test:test().
>> 1.0
>> 0.1
>> 0.06
>> 0.114
>> 0.1554
>> 0.36398
>> 0.358997

One little change:

[begin L = lists:seq(1,N),
      [ self() ! a || _ <- L ],
      S = now(),
      [ receive _ -> ok end || _ <- L ],
      io:format("~w~n", [timer:now_diff(now(), S) / N])
end || N <- [1,10,100,1000,10000,100000,1000000]].

1.0
0.1
0.06
0.091
0.1144
0.11898
0.120905


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